CN108998833B - Calcium sulfate whisker preparation system - Google Patents
Calcium sulfate whisker preparation system Download PDFInfo
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- CN108998833B CN108998833B CN201811008707.1A CN201811008707A CN108998833B CN 108998833 B CN108998833 B CN 108998833B CN 201811008707 A CN201811008707 A CN 201811008707A CN 108998833 B CN108998833 B CN 108998833B
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- calcium sulfate
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- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 title claims abstract description 151
- 238000002360 preparation method Methods 0.000 title claims abstract description 31
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 169
- 239000002956 ash Substances 0.000 claims abstract description 144
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 87
- 230000023556 desulfurization Effects 0.000 claims abstract description 87
- 238000011084 recovery Methods 0.000 claims abstract description 63
- 239000010881 fly ash Substances 0.000 claims abstract description 50
- 238000007664 blowing Methods 0.000 claims abstract description 45
- 238000006243 chemical reaction Methods 0.000 claims abstract description 45
- 238000000967 suction filtration Methods 0.000 claims abstract description 23
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 19
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000001301 oxygen Substances 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000002245 particle Substances 0.000 claims abstract description 16
- 239000000126 substance Substances 0.000 claims abstract description 16
- 239000007789 gas Substances 0.000 claims description 39
- 229920000742 Cotton Polymers 0.000 claims description 31
- 230000009471 action Effects 0.000 claims description 17
- 238000001914 filtration Methods 0.000 claims description 13
- 238000005086 pumping Methods 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 12
- 229920001971 elastomer Polymers 0.000 claims description 9
- 239000005060 rubber Substances 0.000 claims description 9
- 239000011148 porous material Substances 0.000 claims description 2
- 238000011010 flushing procedure Methods 0.000 claims 2
- 238000000034 method Methods 0.000 abstract description 27
- 239000003546 flue gas Substances 0.000 abstract description 19
- 230000008569 process Effects 0.000 abstract description 18
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 17
- 238000005245 sintering Methods 0.000 abstract description 13
- 238000007254 oxidation reaction Methods 0.000 abstract description 11
- 230000003647 oxidation Effects 0.000 abstract description 8
- 230000001590 oxidative effect Effects 0.000 abstract description 3
- 230000002195 synergetic effect Effects 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 abstract description 2
- 239000002910 solid waste Substances 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 22
- 239000002002 slurry Substances 0.000 description 19
- 238000000926 separation method Methods 0.000 description 12
- 239000013078 crystal Substances 0.000 description 11
- 229910052602 gypsum Inorganic materials 0.000 description 11
- 230000000694 effects Effects 0.000 description 9
- 239000010797 grey water Substances 0.000 description 9
- 239000010440 gypsum Substances 0.000 description 9
- 230000005484 gravity Effects 0.000 description 8
- 238000001179 sorption measurement Methods 0.000 description 8
- 239000011575 calcium Substances 0.000 description 6
- 238000002425 crystallisation Methods 0.000 description 6
- 230000008025 crystallization Effects 0.000 description 6
- 238000000605 extraction Methods 0.000 description 6
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L magnesium chloride Substances [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 6
- 238000002156 mixing Methods 0.000 description 6
- 238000004064 recycling Methods 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 229910052925 anhydrite Inorganic materials 0.000 description 5
- 238000004090 dissolution Methods 0.000 description 5
- 239000000428 dust Substances 0.000 description 5
- 238000001027 hydrothermal synthesis Methods 0.000 description 5
- 229910001629 magnesium chloride Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 230000008602 contraction Effects 0.000 description 4
- 238000011049 filling Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000003607 modifier Substances 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 239000006227 byproduct Substances 0.000 description 3
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000035484 reaction time Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- WABPQHHGFIMREM-FTXFMUIASA-N lead-202 Chemical compound [202Pb] WABPQHHGFIMREM-FTXFMUIASA-N 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000010899 nucleation Methods 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 230000002194 synthesizing effect Effects 0.000 description 2
- 238000003828 vacuum filtration Methods 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- GBAOBIBJACZTNA-UHFFFAOYSA-L calcium sulfite Chemical compound [Ca+2].[O-]S([O-])=O GBAOBIBJACZTNA-UHFFFAOYSA-L 0.000 description 1
- 235000010261 calcium sulphite Nutrition 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/60—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape characterised by shape
- C30B29/62—Whiskers or needles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/085—Funnel filters; Holders therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
- B01D29/56—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in series connection
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/30—Combinations with other devices, not otherwise provided for
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/10—Inorganic compounds or compositions
- C30B29/46—Sulfur-, selenium- or tellurium-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B7/00—Single-crystal growth from solutions using solvents which are liquid at normal temperature, e.g. aqueous solutions
- C30B7/10—Single-crystal growth from solutions using solvents which are liquid at normal temperature, e.g. aqueous solutions by application of pressure, e.g. hydrothermal processes
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a calcium sulfate whisker preparation system, and belongs to the technical field of metallurgical solid waste resource utilization. The invention comprises the following steps: the iron powder recovery device is used for separating iron powder in the desulfurized ash and comprises an air inlet pipe, an iron powder recovery cavity, a top cover and a back-blowing air tank; the suction filtration device is used for removing large-particle insoluble substances in the desulfurized fly ash and comprises a filter, a circulating water vacuum pump and a suction filtration unit; and the reaction device is used for preparing the calcium sulfate whiskers from the desulfurized ash after the iron powder is separated and comprises an oxygen cylinder and a high-pressure reaction kettle. The method takes the sintering flue gas desulfurization ash as a raw material, adopts the hydrothermal system to oxidize and prepare the calcium sulfate whisker synergistically, realizes the synergistic preparation of the calcium sulfate whisker by oxidizing the sintering flue gas desulfurization ash, and solves the problem of CaSO3Difficult rapid oxidation and longer process flow of the preparation process of the calcium sulfate whisker, improves the recovery utilization rate of the desulfurized fly ash and improves the quality of the calcium sulfate whisker.
Description
Technical Field
The invention relates to metallurgical solid waste resource utilization, in particular to a calcium sulfate whisker preparation system.
Background
The sintering process is an important link in the modern steel production process and is also a main pollutant emission source in the steel industry, wherein more than 70 percent of SO is generated in the steel industry2From the sintering step. With country to SO2The pollution control and the environmental protection consciousness of China are enhanced, and SO in the sintering process is reduced2The emission of the natural gypsum is the key point of the emission reduction of the waste gas in the steel industry, and the research on the comprehensive utilization of the sintering ore flue gas desulfurization ash is gradually concerned by people, so that the existing steel enterprises have matched and constructed desulfurization systems with different processes, and the utilization of the sintering ore flue gas desulfurization ash can reduce the capital consumption caused by stacking, the occupied land and the environmental pollution, reduce the consumption of the natural gypsum, further reduce the exploitation amount of the natural gypsum and protect the ecological environment. Therefore, many colleges and enterprises have conducted a great deal of research on the comprehensive utilization of the sintered ore flue gas desulfurization ash, such as preparation of sulfuric acid, cement retarders, gypsum building materials, calcium sulfate whiskers and the like by using the sintered flue gas desulfurization ash. The calcium sulfate whisker prepared by sintering flue gas desulfurization ash has higher added value, is a short fiber grown in a single crystal form, has uniform cross section, complete appearance and highly perfect internal structure, and has the advantages of extremely high strength, fine size, easy combination with organic high molecular compounds such as resin, rubber, plastic and the like and excellent appearance quality compared with glass fiber. The method for preparing the calcium sulfate whiskers by using the desulfurized gypsum as the raw material can reduce the pollution of the desulfurized gypsum to the environment, can save natural gypsum resources, and opens up a new way for the high-added-value utilization of the desulfurized gypsum, but the existing method for preparing the calcium sulfate whiskers by using the desulfurized ash is still imperfect, so that the quality of the calcium sulfate whiskers is poor, and the high-efficiency resource application of the desulfurized ash is seriously limited。
Through patent retrieval, Stepeyang of the university in northeast has also carried out related research, and related patents are applied, and a method for preparing calcium sulfate whiskers by using sintering ore flue gas desulfurization byproducts (application No. 201010545829.1; application No. 2010.11.16) and a method for preparing calcium sulfate whiskers by using flue gas desulfurization gypsum (application No. 200810011193.5; application No. 2008.04.25) also provide a way for recycling of desulfurization byproducts. However, the quality of the calcium sulfate whisker produced by the existing method is poor, and the high value-added application of the desulfurization byproduct is limited. In addition, the name of the invention is as follows: the treatment device for semi-dry desulfurized fly ash (patent application No. CN 201610076883.3; application publication No. 2016.05.04) comprises an adsorption tower arranged above a heating furnace, wherein flue gas generated by heating semi-dry desulfurized fly ash is cooled by cold air blown by a draught fan in an air inlet flue and then enters a lower adsorption chamber, and active coke in the lower adsorption chamber is used for treating SO in the flue gas2Carrying out first adsorption, then making the flue gas pass through the transition flue and enter into the upper adsorption chamber, and making the active coke in the upper adsorption chamber to make SO in the flue gas2And carrying out secondary adsorption, and then discharging the flue gas from a chimney after the flue gas enters the air outlet flue. Therefore, the desulfurization treatment of the semi-dry desulfurization ash is rapidly realized, the problem of secondary pollution of the semi-dry desulfurization ash is solved, and the technical problem of reutilization of the desulfurization ash is still not solved. In addition, the name of the invention is as follows: a desulfurization ash treatment apparatus and method (patent application No. CN201610344246. X; application publication No. 2016.10.12) by providing a desulfurization ash treatment apparatus comprising: the device comprises a vertical mill, a dust collector, a hot blast stove, a primary hot blast pipe and a secondary hot blast pipe; a slag inlet for slag to enter is formed in the vertical mill; the dust collector is connected with the vertical mill; the joint of the primary hot air pipe and the secondary hot air pipe is provided with an air mixing inlet. Through the oxidation modification of the desulfurized fly ash in hot air, the formed slag powder product is greatly shortened in condensation time, the investment and the process cost of low-temperature calcination equipment are saved, and the technical problems that the treatment cost is increased and a new pollution source is formed due to the desulfurized fly ash treatment mode in the prior art are effectively solved. But do notThe problem of recycling iron powder from the desulfurized fly ash is still not solved.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention aims to overcome the defects that a system for preparing calcium sulfate whiskers by sintering flue gas desulfurization ash is not mature in the prior art, so that the quality of the calcium sulfate whiskers is poor, and provides a calcium sulfate whisker preparation system which can further solve the problems of resource waste and pollution of the desulfurization ash in the production process.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the invention discloses a calcium sulfate whisker preparation system, which comprises an iron powder recovery device, a dust removal device and a dust removal device, wherein the iron powder recovery device is used for separating iron powder in desulfurized ash and comprises an air inlet pipe, an iron powder recovery cavity, a top cover and a back-blowing air tank; an electromagnet and a cotton sleeve are arranged in the iron powder recovery cavity, the cotton sleeve is wrapped outside the electromagnet, the electromagnet comprises a lead and an iron core, the lead is wound outside the iron core, and the surface of the iron core is provided with an air vent which is communicated with the cylinder core of the iron core; the top cover is arranged at the top of the iron powder recovery cavity, and a filter layer is arranged inside the top cover; the air inlet pipe is arranged at the bottom of the iron powder recovery cavity, and the desulfurized ash enters the iron powder recovery cavity through the air inlet pipe; the back-blowing gas tank is connected with the cylinder core of the iron core through a gas pipeline, and the bottom of the air inlet pipe is provided with a recovery tank; the suction filtration device is used for removing large-particle insoluble substances in the desulfurized ash and comprises a filter, a circulating water vacuum pump and a suction filtration unit, wherein the circulating water vacuum pump is connected with an air extraction opening of the suction filtration unit through a rubber hose; and the reaction device is used for preparing the calcium sulfate whiskers from the desulfurized ash after the iron powder is separated and comprises an oxygen cylinder and a high-pressure reaction kettle, wherein the oxygen cylinder is connected with an air inlet at the top of the high-pressure reaction kettle through a pipeline.
Preferably, an oxygen valve is arranged on an air inlet at the top of the high-pressure reaction kettle, a pressure release valve is arranged on a pipeline between the air inlet and the high-pressure reaction kettle, a gas pressure meter is arranged on the high-pressure reaction kettle, and a stirring blade is arranged in the high-pressure reaction kettle.
Preferably, the suction filtration unit comprises a buchner funnel, an air suction port and a vacuum pumping bottle, wherein the buchner funnel is arranged above the vacuum pumping bottle, the air suction port is arranged on one side of the vacuum pumping bottle, the air suction port is connected with a circulating water vacuum pump through a rubber hose, and the filter is arranged above the buchner funnel.
Preferably, the electromagnet comprises a first electromagnet, a second electromagnet and a third electromagnet, wherein the first electromagnet and the second electromagnet are arranged in parallel, a gap is arranged between the first electromagnet and the second electromagnet, the third electromagnet is arranged at the upper parts of the first electromagnet and the second electromagnet, and the third electromagnet is arranged corresponding to the gap.
Preferably, the back-blowing air tank is connected with an air main pipe, the air main pipe is connected with a first air branch pipe and a second air branch pipe, and the first air branch pipe is communicated with two ends of an iron core of the third electromagnet; the second airflow branch pipe is respectively communicated with the iron cores of the first electromagnet and the second electromagnet.
Preferably, the blowing air current of air-supply line will be desulfurized ash and blown to the iron powder recovery cavity in, and desulfurized ash is blown around the electro-magnet under the effect of blowing air current, and the iron powder in the desulfurized ash is adsorbed on the telescopic surface of cotton by the electro-magnet, and the blowback air current outwards overflows through the air vent on electro-magnet iron core surface simultaneously, avoids the desulfurized ash to permeate in the cotton sleeve.
Preferably, a filter screen is arranged in the middle of the filter, the filtering pore size of the filter screen is smaller than the diameter of large-particle insoluble substances and larger than the diameter of the desulfurized ash, a filtering outlet is arranged at the bottom of the filter, and the filtering outlet is arranged at the upper part of the Buchner funnel.
Preferably, the third electromagnet comprises a left electromagnet and a right electromagnet, the joint of the left electromagnet and the right electromagnet is located right above the gap, and the included angle between the joints of the left electromagnet and the right electromagnet is β and ranges from 120 degrees to 150 degrees.
Preferably, the back-blowing air tank is connected with an air main pipe, the air main pipe is connected with a first air branch pipe and a second air branch pipe, and the first air branch pipe is communicated with two ends of an iron core of the third electromagnet; the second airflow branch pipe is respectively communicated with the iron cores of the first electromagnet and the second electromagnet.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:
(1) according to the calcium sulfate whisker preparation system, iron powder and desulfurized ash in desulfurized ash are separated, large-particle insoluble substances in desulfurized ash are screened out to obtain pretreated desulfurized ash, and the pretreated desulfurized ash and MgCl are added2The solution is fully and uniformly stirred to obtain slurry, then the slurry is transferred to a high-pressure reaction kettle of a reaction device for hydro-thermal synthesis to obtain calcium sulfate whiskers, and in the process of synthesizing the calcium sulfate whiskers by using the desulfurized ash for separating iron powder, the iron powder doped in the desulfurized ash and calcium sulfite in the desulfurized ash can be prevented from competing for dissolved oxygen in the slurry in a hydro-thermal system, and the iron powder in the desulfurized ash is prevented from becoming a crystallization attachment point of new calcium sulfate, so that a large amount of nucleation of the calcium sulfate whiskers is caused, and the growth process of the calcium sulfate whiskers is hindered;
(2) according to the calcium sulfate whisker preparation system, the desulfurization ash is blown to the iron powder recovery cavity by the blowing air flow of the air inlet pipe, the electromagnet generates magnetic force to adsorb the iron powder in the desulfurization ash on the surface of the cotton sleeve, the cotton sleeve improves the friction force between the iron powder and the surface of the electromagnet, the iron powder adsorbed on the surface of the electromagnet is prevented from being blown down by wind, and the separation of the electromagnet on the iron powder in the desulfurization ash is promoted; the electromagnet is started, and meanwhile, the air valve of the back-blowing air tank is opened, back-blowing air in the back-blowing air tank enters the cylinder core of the iron core of the electromagnet through a pipeline, and then back-blowing air flows overflow from the vent holes on the surface of the iron core to the outside of the electromagnet, so that desulfurization ash is prevented from permeating into gaps of the cotton sleeve under the action of the blowing air, separation of the desulfurization ash and iron powder is promoted, and the recovery rate of the desulfurization ash is improved;
(3) the invention relates to a calcium sulfate whisker preparation system, which is characterized in that desulfurization ash which is taken out from a recovery tank and is removed of iron powder is uniformly mixed with water to obtain desulfurization grey water solution, then the desulfurization grey water solution is moved into a suction filtration device, large-particle insoluble substances in the desulfurization ash are removed through a filter screen, the desulfurization grey water solution enters a filter outlet at the bottom of a filter through holes in the filter screen and flows into a Buchner funnel along the filter outlet, at the moment, a circulating water vacuum pump performs vacuum pumping operation to obtain pretreated desulfurization ash, and the pretreated desulfurization ash is moved into a reaction device to be subjected to hydrothermal synthesis to obtain calcium sulfate whiskers; large-particle insoluble substances in the desulfurized fly ash can be removed by using a vacuum pump for suction filtration, and the quality of the calcium sulfate whisker prepared from the desulfurized fly ash is improved.
Drawings
FIG. 1 is a schematic configuration view of an apparatus for separating iron powder from desulfurized fly ash according to example 1;
FIG. 2 is a schematic top view of the top cover of embodiment 1;
FIG. 3 is a schematic structural view of a suction filtration apparatus according to example 1;
FIG. 4 is a schematic structural view of a filter according to example 1;
FIG. 5 is a schematic view of the structure of a reaction apparatus of example 1;
FIG. 6 is a schematic configuration view of an apparatus for separating iron powder from desulfurized fly ash according to example 2;
FIG. 7 is a schematic configuration view of an apparatus for separating iron powder from desulfurized fly ash according to example 2;
FIG. 8 is an SEM image of calcium sulfate whiskers of example 4;
figure 9 is an SEM image of calcium sulfate whiskers without iron removal from example 4;
fig. 10 is a schematic structural diagram of a calcium sulfate whisker preparation system of the invention.
The reference numerals in the schematic drawings illustrate:
100. an air inlet pipe; 110. a first air inlet pipe; 120. a second air inlet pipe; 130. the joint of the air pipe; 131. a bellows; 140. a recovery tank; 150. a blower fan; 101. a desulfurized fly ash tank; 102. a delivery pipe; 103. a pressurized gas tank; 104. a material valve;
200. a ferrous powder recovery cavity; 201. a power-on head; 202. a wire; 203. a cotton sleeve; 204. a vent hole; 205. an iron core; 210. a first electromagnet; 220. a second electromagnet; 230. a third electromagnet; 231. a left electromagnet; 232. a right electromagnet; 240. a cavity contraction section;
310. a top cover; 320. a filter layer;
410. a blowback gas tank; 420. a main airflow pipe; 421. a first gas flow branch pipe; 422. a second gas flow branch pipe; 423. a first blowback valve; 424. a second blowback valve;
520. a high-pressure reaction kettle; 521. a pressure relief valve; 522. a barometer; 523. an air inlet; 524. a gas heater; 525. a stirring blade; 526. a heat-insulating layer; 527. a thermometer; 528. an oxygen valve;
610. a Buchner funnel; 620. an air extraction opening; 630. a vacuum gas pumping bottle; 640. a rubber hose; 650. a circulating water vacuum pump;
710. filtering with a screen; 720. and (6) filtering an outlet.
Detailed Description
The detailed description and exemplary embodiments of the invention will be better understood when read in conjunction with the appended drawings, where the elements and features of the invention are identified by reference numerals.
Example 1
As shown in fig. 10, the calcium sulfate whisker preparation system of the present invention includes an iron powder recovery device, a suction filtration device and a reaction device; the iron powder recovery device is used for separating iron powder in the desulfurized fly ash, the suction filtration device is used for removing large-particle insoluble substances in the desulfurized fly ash, and the reaction device is used for preparing calcium sulfate whiskers from the desulfurized fly ash after the iron powder is separated. In this embodiment, as shown in fig. 1, the iron powder recycling device includes an air inlet pipe 100, an iron powder recycling cavity 200, a top cover 310, and a blowback air tank 410; an electromagnet and a cotton sleeve 203 are arranged in the iron powder recovery cavity 200, the cotton sleeve 203 is wrapped outside the electromagnet, the desulfurization ash is injected into the iron powder recovery cavity 200 by the injection air flow of the air inlet pipe 100, the electromagnet generates magnetic force to adsorb iron powder in the desulfurization ash onto the surface of the cotton sleeve 203, the friction force between the surface of the electromagnet and the iron powder is improved by the cotton sleeve 203, and the iron powder adsorbed on the surface of the electromagnet is prevented from being blown off by the injection air flow; the electromagnet comprises a conducting wire 202 and an iron core 205, wherein the conducting wire 202 is wound outside the iron core 205, the electromagnet comprises a first electromagnet 210, a second electromagnet 220 and a third electromagnet 230, the desulfurized ash moves to the periphery of the first electromagnet 210 and the second electromagnet 220, and iron powder in the desulfurized ash is adsorbed on the surface of the cotton sleeve 203 by the first electromagnet 210 and the second electromagnet 220; then, the desulfurized fly ash continues to move upward under the action of the blowing air flow, and when the desulfurized fly ash moves to the periphery of the third electromagnet 230, iron powder in the desulfurized fly ash is adsorbed on the surface of the third electromagnet 230.
Further, the first electromagnet 210 and the second electromagnet 220 are arranged in parallel, a gap is formed between the first electromagnet 210 and the second electromagnet 220, the third electromagnet 230 is arranged on the upper portions of the first electromagnet 210 and the second electromagnet 220, the third electromagnet 230 is arranged corresponding to the gap, the electromagnets at different positions and different levels can be in full contact with the desulfurization ash due to the vertical arrangement mode of the electromagnets, so that the electromagnets can adsorb and recover the iron powder at different positions in the cavity 200, and further the separation efficiency of the iron powder in unit time is improved.
It is worth to be noted that the blowback gas tank 410 is connected with the cylinder center of the iron core 205 through a gas pipeline, the blowback gas tank 410 is connected with a gas main pipe 420, the gas main pipe 420 is connected with a first gas branch pipe 421 and a second gas branch pipe 422, and the first gas branch pipe 421 is communicated with two ends of the iron core 205 of the third electromagnet 230; the second airflow branch pipe 422 is respectively communicated with the iron cores 205 of the first electromagnet 210 and the second electromagnet 220, the surface of the iron core 205 is provided with a vent hole 204, the vent hole 204 is communicated with the cylinder core of the iron core 205, and then the blowback air tank 410 can convey blowback airflow to the cylinder core of the iron core 205 through an air pipeline; in addition, the diameter of the vent hole 204 is larger than that of the lead 202, so that when the lead 202 passes through the outer surface of the vent hole 204, the back-blowing airflow entering the iron core 205 can also flow out from gaps around the vent hole 204, and then is diffused to the outside through the cotton sleeve 203, and the back-blowing airflow diffused to the outside can prevent the desulfurized ash from entering the cotton sleeve 203 under the action of the blowing airflow, so that the effect of separating iron powder in the desulfurized ash is achieved.
As shown in fig. 2, the top cover 310 is disposed on the top of the iron powder recovery cavity 200, the filter layer 320 is disposed inside the top cover 310, the air inlet pipe 100 is disposed at the bottom of the iron powder recovery cavity 200, and the blowing air flow in the air inlet pipe 100 is used for blowing the desulfurized ash into the iron powder recovery cavity 200, so that the desulfurized ash enters the iron powder recovery cavity 200 through the air inlet pipe 100; the blowing air flow entering the iron powder collection cavity 200 from the air inlet pipe 100 flows out of the iron powder collection cavity 200 through the filter layer 320, so that the pressure intensity in the iron powder collection cavity 200 and the external pressure intensity are balanced, and the smooth separation process is ensured. An internal thread is arranged inside the top of the iron powder recovery cavity 200, and an external thread matched with the internal thread inside the top of the iron powder recovery cavity 200 is arranged on the outer side wall of the top cover 310, so that the iron powder recovery cavity 200 is connected with the top cover 310 through the thread, and the mounting efficiency can be improved through the thread connection mode; in addition, the filtering layer 320 is arranged inside the top cover 310, the filtering layer 320 is provided with a through hole, the through hole is matched with the power-on head 201, the power-on head 201 penetrates through the filtering layer 320 through the through hole, the power-on head 201 penetrates through the filtering layer 320 and extends to the outside of the top cover 310, and the power-on head 201 is electrically connected with a power supply. The filter layer 320 is a gauze, a filling layer with gaps or a dust removal cloth bag, gas can flow out through the filter layer 320 in the iron powder recovery process, and the filter layer 320 can limit the treated desulfurization ash in the iron powder recovery cavity 200, so that the treated desulfurization ash is concentrated in the iron powder recovery cavity 200, and the desulfurization ash is prevented from overflowing out of the iron powder recovery cavity 200 while the iron powder in the desulfurization ash is safely and efficiently separated.
Further, the air inlet pipe 100 is disposed at the bottom of the iron powder recovery cavity 200, and the desulfurized ash enters the iron powder recovery cavity 200 through the air inlet pipe 100; the bottom of the air inlet pipe 100 is provided with a recovery tank 140, the blowing air flow of the air inlet pipe 100 blows the desulfurization ash into the iron powder recovery cavity 200, the desulfurization ash is blown to the periphery of the electromagnet under the action of the blowing air flow, the iron powder in the desulfurization ash is adsorbed on the surface of the cotton sleeve 203 by the electromagnet, meanwhile, the back blowing air flow overflows outwards through the vent holes 204 on the surface of the electromagnet iron core 205, and the desulfurization ash is prevented from permeating into the cotton sleeve 203.
As shown in fig. 3 and 4, the suction filtration apparatus comprises a filter, a circulating water vacuum pump 650 and a suction filtration unit, the filter is disposed above a buchner funnel 610, a filter screen 710 is disposed in the middle of the filter, the filter aperture of the filter screen 710 is smaller than the diameter of the large-particle insoluble substance and larger than the diameter of the desulfurized ash, a filter outlet 720 is disposed at the bottom of the filter, the desulfurized ash is moved into the filter after being stirred with distilled water uniformly after being deprived of iron powder, the large-particle insoluble substance in the desulfurized grey water solution is blocked on the upper surface of the filter screen 710 under the action of the filter screen 710 of the filter, the large-particle insoluble substance in the desulfurized ash can be removed, the remaining part of the desulfurized grey water solution flows to the bottom of the filter along the holes in the filter screen 710, the desulfurized grey water solution flowing into the bottom of the filter continues to flow to the filter outlet 720 disposed, and then flows into the suction filtration unit disposed below the filtering outlet 720.
It is worth to be noted that, the suction filtration unit includes buchner funnel 610, extraction opening 620 and vacuum pumping bottle 630, one side of vacuum pumping bottle 630 is provided with extraction opening 620, extraction opening 620 is connected with circulating water vacuum pump 650 through rubber hose 640, buchner funnel 610 is arranged above vacuum pumping bottle 630, so that circulating water vacuum pump 650 can perform suction filtration work on the desulfurization grey water solution in the suction filtration unit, and further remove the excess moisture in the desulfurization ash, the suction filtration unit performs suction filtration on the desulfurization grey water solution, firstly, the power supply of circulating water vacuum pump 650 is turned on, the desulfurization ash water solution flows into buchner funnel 610 under the action of gravity, circulating water vacuum pump 650 is connected with extraction opening 620 arranged at one side of vacuum pumping bottle 630 through rubber hose 640, the desulfurization grey water solution in buchner funnel 610 starts the vacuum pumping work through rubber hose 640, the pretreated desulfurization ash is obtained after vacuum filtration, and large-particle insoluble substances in the desulfurized fly ash are screened out, so that the purity of the desulfurized fly ash can be improved.
As shown in fig. 5, in this embodiment, the reaction device includes an oxygen cylinder 510 and a high pressure reactor 520, the oxygen cylinder 510 is connected to an air inlet 523 at the top of the high pressure reactor 520 through a pipeline, an oxygen valve 528 is disposed on the air inlet 523 at the top of the high pressure reactor 520, a pressure relief valve 521 is disposed on the pipeline between the air inlet 523 and the high pressure reactor 520, a gas pressure gauge 522 is disposed on the high pressure reactor 520, and a stirring blade 525 is disposed in the high pressure reactor 520. Mixing the pretreated desulfurized fly ash with MgCl2And fully and uniformly mixing the solution, stirring uniformly to prepare slurry, adjusting the pH value of the slurry to be between 8 and 9, adding the slurry into the high-pressure reaction kettle 520, closing the top cover of the high-pressure reaction kettle 520, filling oxygen into the high-pressure reaction kettle 520, controlling the stirring strength in the high-pressure reaction kettle 520 to be 400-doped 600r/min, and reacting for 2 to 3 hours to perform hydrothermal synthesis to obtain the calcium sulfate whisker. The stirring intensity and the reaction time in the high-pressure reaction kettle 520 are controlled, so that the hydrothermal system has higher temperature and pressure, and the CaSO in the desulfurized fly ash can be promoted3·0.5H2Continuous dissolution of O and SO generated after dissolution3 2-Is oxidized into SO rapidly4 2-To make Ca in the solution2 +、SO4 2-Is always in a supersaturated state, and simultaneously, the oxidation reaction is uninterruptedly carried out, thereby providing power for the crystallization and the growth of the calcium sulfate crystal whisker, realizing the synergistic preparation of the calcium sulfate crystal whisker by the oxidation of the sintering flue gas desulfurization ash, and further solving the problem of CaSO3Difficult rapid oxidation and long process flow of the preparation of the calcium sulfate whisker.
Example 2
As shown in fig. 6 to 7, the basic contents of a calcium sulfate whisker preparation system of this example are the same as example 1, except that: the blowback gas tank 410 is connected with an air main pipe 420, the air main pipe 420 is connected with a first air branch pipe 421 and a second air branch pipe 422, the first air branch pipe 421 is communicated with two ends of the iron core 205 of the third electromagnet 230, and it is worth noting that: the first air flow branch pipe 421 is communicated with the cylinder core of the iron core 205, the cylinder core is a hollow channel, the cylinder core is communicated with the vent hole 204 on the surface of the iron core 205, and a sealing ring is arranged at the position where the first air flow branch pipe 421 is connected with the cylinder core, so that the leakage of the back-blowing air flow from the two ends of the cylinder core of the iron core 205 is avoided; the second airflow branch pipe 422 is respectively communicated with the iron cores 205 of the first electromagnet 210 and the second electromagnet 220, namely the second airflow branch pipe 422 is communicated with the cylinder core in the iron core 205, and a sealing ring is arranged at the connecting position of the second airflow branch pipe 422 and the cylinder core. The air inlet of the second air flow branch pipe 422 includes a left port connected to the left end of the core 205 of the first electromagnet 210 and a right port connected to the right end of the core 205 of the second electromagnet 220. The gas flow generated by the blowback gas tank 410 enters the first gas flow branch pipe 421 and the second gas flow branch pipe 422 through gas pipelines respectively; a first blowback valve 423 is arranged on the first air branch pipe 421, and a second blowback valve 424 is arranged on the second air branch pipe 422; the first blowback valve 423 is used for controlling the flow of the gas in the first branch 421, and the second blowback valve 424 is used for controlling the flow of the gas in the second branch 422. The first electromagnet 210 and the second electromagnet 220 are positioned close to the air inlet pipe 100, the power supply provides electric energy for the electromagnets through the electrifying head 201, and then the electromagnets generate magnetic force through electromagnetic induction, on one hand, because the probability that the first electromagnet 210 and the second electromagnet 220 at the positions are contacted with iron powder in the desulfurized ash is higher, the number of turns of the conducting wires 202 on the first electromagnet 210 and the second electromagnet 220 can be properly increased, and further the electromagnetic strength at the positions of the first electromagnet 210 and the second electromagnet 220 can be enhanced; on the other hand, the third electromagnet 230 is located farther from the air inlet duct 100 than the first electromagnet 210 and the second electromagnet 220, so that the probability of contact between the third electromagnet 230 and the iron powder in the desulfurized fly ash is lower, and the number of turns of the wire 202 on the third electromagnet 230 needs to be increased appropriately under the condition of the same current, so as to enhance the electromagnetic strength at the third electromagnet 230, thereby improving the adsorption of the third electromagnet 230 on the iron powder blown into the top end of the iron powder recovery cavity 200, further avoiding the situation that the iron powder adsorbed on the surface of the cotton sleeve 203 falls into the desulfurized fly ash again due to the blowback airflow, and reducing the separation purity of the desulfurized fly ash.
It should be noted that the desulfurized ash can permeate into the cotton sleeve 203 under the action of the blowing air flow of the air inlet pipe 100, so that the desulfurized ash is left in the cotton sleeve 203, the separation effect of the iron powder is poor, and at the moment, the air flow in the second air flow branch pipe 422 can be controlled by adjusting the second blowback valve 424, so that the blowback air flow flows from the inner surface to the outer surface of the cotton sleeve 203, and the desulfurized ash is prevented from being attached to the fiber holes of the cotton sleeve 203. Iron powder in the desulfurized fly ash is adsorbed on the surface of the cotton sleeve 203 under the action of electromagnetic force, and the desulfurized fly ash moving to the position near the electromagnet moves reversely to be far away from the cotton sleeve 203 under the action of the blowback air flow of the vent holes 204, so that the separation of the desulfurized fly ash and the iron powder is promoted, and the separation effect of the iron powder in the desulfurized fly ash is improved. The third electromagnet 230 is far away from the air inlet duct 100, and when the desulfurized ash moves to the vicinity of the third electromagnet 230, the gas impact on the desulfurized ash is smaller than that on the first electromagnet 210 and the second electromagnet 220, so in this embodiment, the gas flow in the first gas flow branch pipe 421 can be controlled by the first blowback valve 423, so that the gas flow in the first gas flow branch pipe 421 is smaller than that in the second gas flow branch pipe 422.
In addition, because the blowing air flow in the air inlet pipe 100 has a certain air pressure, the desulfurized ash can not enter the air inlet pipe 100 through the conveying pipe 102 by virtue of the self gravity, so that the embodiment is provided with a sealing cover at the top of the desulfurized ash groove 101, and the pressurized air tank 103 is connected with the desulfurized ash groove 101 through a pipeline; the pressurized gas tank 103 provides air pressure for the sealed desulfurization ash tank 101, so as to balance the air pressure in the air inlet pipe 100, so that the desulfurization ash is conveyed into the air inlet pipe 100 through the conveying pipe 102 under the action of the air pressure and the self gravity provided by the pressurized gas tank 103, the blowing air flow in the air inlet pipe 100 blows the desulfurization ash upwards into the iron powder recovery cavity 200 along the pipeline direction of the air inlet pipe 100, and then the iron powder in the desulfurization ash is separated in the iron powder recovery cavity 200.
Example 3
The basic contents of a calcium sulfate whisker preparation system of this example are the same as example 1, except that: the air inlet pipe 100 comprises a first air inlet pipe 110 and a second air inlet pipe 120, the first air inlet pipe 110 and the second air inlet pipe 120 are arranged correspondingly, an included angle between the first air inlet pipe 110 and the second air inlet pipe 120 is a, the range of the a is 90-120 degrees, the first air inlet pipe 110 and the second air inlet pipe 120 can generate opposite blowing air flow at the bottom of the iron powder recovery cavity 200, so that the desulfurized ash is better dispersed, the desulfurized ash is blown to the top from the bottom of the iron powder recovery cavity 200 under the action of the blowing air flow, the desulfurized ash is prevented from falling down under the action of self gravity and being accumulated at the bottom of the iron powder recovery cavity 200, further, the full contact between the iron-containing desulfurized ash and the electromagnet is promoted, and the separation efficiency of the electromagnet on iron powder is improved.
A desulfurization ash groove 101 is formed in one side, away from the second air inlet pipe 120, of the first air inlet pipe 110; the bottom of the desulfurization ash tank 101 is connected with a first air inlet pipe 110 through a conveying pipe 102; a desulfurization ash groove 101 is formed in one side, away from the first air inlet pipe 110, of the second air inlet pipe 120; the bottom of the desulfurization ash tank 101 is connected with a second air inlet pipe 120 through a conveying pipe 102; the desulfurized ash in the desulfurized ash tank 101 is respectively added into the first air inlet pipe 110 and the second air inlet pipe 120 through the conveying pipe 102, so that the desulfurized ash is conveniently and directly added into the air inlet pipe 100 along the conveying pipe 102, the online separation of iron powder in the desulfurized ash is realized, and the actual production efficiency is improved. An end of the air inlet duct 100 remote from the fine iron recovery chamber 200 is provided with a blower fan 150, and the blower fan 150 is used to blow an air current into the air inlet duct 100. Since the air flow in the air inlet pipe 100 has a certain air pressure, when the air pressure is higher, the desulfurized ash cannot enter the air inlet pipe 100 from the desulfurized ash groove 101 along the conveying pipe 102 by virtue of its own gravity, so that the embodiment is provided with a sealing cover at the top of the desulfurized ash groove 101, and the pressurized air tank 103 is connected with the desulfurized ash groove 101 through a pipeline. The pressurized gas tank 103 provides air pressure to the sealed desulfurization ash tank 101, so as to balance the pressure of the air flow in the air inlet pipe 100, so that the desulfurization ash is conveyed into the air inlet pipe 100 through the conveying pipe 102 under the action of the air pressure and the self gravity provided by the pressurized gas tank 103, the air flow continuously blown into the air inlet pipe 100 blows the desulfurization ash upwards into the iron powder recovery cavity 200 along the pipeline direction of the air inlet pipe 100, and the iron powder in the desulfurization ash is separated in the iron powder recovery cavity 200.
Further, a cavity contracting section 240 is arranged at the bottom of the iron powder recovering cavity 200, and the air inlet pipe 100 is connected with the bottom of the cavity contracting section 240; the air inlet pipe 100 is connected with the bottom of the iron powder recovery cavity 200 through a cavity contraction section 240, an air pipe joint 130 is arranged between the first air inlet pipe 110 and the second air inlet pipe 120, the air pipe joint 130 is arranged corresponding to a gap between the first electromagnet 210 and the second electromagnet 220, and the air pipe joint 130 extends into the cavity contraction section 240 to a position higher than the bottom of the cavity contraction section 240. The direction upward movement of the jetting air current that air-supply line 100 produced respectively along first air-supply line 110 and second air-supply line 120, the jetting air current is gathered and is got into cavity constriction section 240 at tuber pipe junction 130, the bottom shrink design of cavity constriction section 240, make the jetting air current gather up upward movement, thereby the relative gathering of the jetting air current of air-supply line 100 insufflations at cavity constriction section 240, be favorable to the desulfurization ash to blow to the top by the bottom of iron powder recovery cavity 200 under the effect of jetting air current, avoid the desulfurization ash to deposit in iron powder recovery cavity 200 bottom because of the atress inequality falls under the effect of self gravity, and then lead to the separation effect of desulfurization ash relatively poor. The conveying pipe 102 is provided with a material valve 104, and the material valve 104 can be opened or closed according to requirements; the bottom side walls of the first and second air inlet ducts 110 and 120 are connected to a blower fan 150 through a duct provided with a blower valve for controlling the flow rate of gas in the duct; a recycling groove 140 is provided right below the bottoms of the first and second air inlet ducts 110 and 120, and the recycling groove 140 is used for collecting the desulfurized fly ash after the separation of the iron powder.
Further, the upper end of the cavity contracting section 240 is connected with the bottom of the iron powder recovery cavity 200 through the corrugated pipe 131, the lower end of the cavity contracting section 240 is connected with the top of the air inlet pipe 100 through the corrugated pipe 131, and the cavity contracting section 240 is provided with a vibration mechanism for driving the cavity contracting section 240 to vibrate, so that the desulfurization ash accumulated on the cavity contracting section 240 falls to the recovery tank 140 through the first air inlet pipe 110 and the second air inlet pipe 120, thereby facilitating the sufficient collection of the desulfurization ash of the separated iron powder, and improving the yield of the calcium sulfate whisker prepared by utilizing the desulfurization ash.
Example 4
The basic contents of a calcium sulfate whisker preparation system of this example are the same as example 1, except that: the calcium sulfate whisker is prepared by using a calcium sulfate whisker preparation system,
the method comprises the following steps: pretreatment of desulfurized fly ash
Separating iron powder from the desulfurized fly ash, and removing large-particle insoluble substances from the desulfurized fly ash to obtain pretreated desulfurized fly ash; the detailed steps are as follows:
(1) adding desulfurized ash into a desulfurized ash and iron powder separating device, starting an electromagnet, simultaneously opening an air valve of a back-blowing air tank 410, enabling back-blowing air in the back-blowing air tank 410 to flow into a cylinder core of an electromagnet iron core 205 through a pipeline, and then enabling back-blowing air flow to overflow to the outside of the electromagnet through an air hole 204 on the surface of the iron core 205;
the blowback air flow in the blowback air tank 410 enters the first air flow branch pipe 421 and the second air flow branch pipe 422 through the air flow main pipe 420, and simultaneously controls the flow of the first blowback valve 423 and the second blowback valve 424;
(2) starting the blast fan 150, and spraying blowing air flow generated by the blast fan 150 into the iron powder recovery cavity 200 from bottom to top through the air inlet pipe 100;
(3) conveying the desulfurized ash into an air inlet pipe 100 through a desulfurized ash tank 101;
adding the desulfurization ash into a desulfurization ash tank 101, starting an air valve of a pressurization air tank 103, pressurizing the desulfurization ash tank 101 by the pressurization air tank 103, then opening a material valve 104, and conveying the desulfurization ash in the desulfurization ash tank 101 into an air inlet pipe 100 through a conveying pipe 102;
(4) the blowing air flow of the air inlet pipe 100 blows the desulfurized fly ash into the iron powder recovery cavity 200, and the iron powder in the desulfurized fly ash is adsorbed on the surface of the cotton sleeve 203;
the blowing air flow of the air inlet pipe 100 blows the desulfurization ash into the iron powder recovery cavity 200, the desulfurization ash is blown to the periphery of the electromagnet under the action of the blowing air flow, the iron powder in the desulfurization ash is adsorbed on the surface of the cotton sleeve 203 by the electromagnet, meanwhile, the blowback air flow overflows outwards through the vent holes 204 on the surface of the electromagnet iron core 205, and the desulfurization ash is prevented from permeating into the cotton sleeve 203;
(5) the desulfurized fly ash after the iron powder is separated after the blowing air flow of the air inlet pipe 100 is closed falls into the recovery tank 140 under the action of gravity;
(6) taking the desulfurized fly ash from which the iron powder is removed out of the recovery tank 140, mixing the desulfurized fly ash with water, screening out large-particle insoluble substances, and placing the desulfurized fly ash from which the large-particle insoluble substances are screened out in a Buchner funnel 610 for vacuum filtration to obtain pretreated desulfurized fly ash;
step two: preparation of calcium sulfate whisker
Mixing the pretreated desulfurized fly ash with MgCl2Mixing the solutions to obtain slurry, transferring the slurry into a high-pressure reaction kettle 520 of a reaction device, introducing oxygen into the high-pressure reaction kettle 520, adjusting the pressure in the high-pressure reaction kettle 520 to be 1-2 MPA and the temperature to be 120-180 ℃, wherein the temperature in the embodiment is 180 ℃; thereby synthesizing the calcium sulfate whisker in the high-pressure reaction kettle 520 by hydrothermal reaction; the method comprises the following specific steps:
(1) MgCl with a concentration of 2% is prepared2The solution acts as a habit modifier to MgCl2Adding the solution into the pretreated desulfurized ash, and uniformly stirring to obtain slurry, wherein the solid-to-liquid ratio of the slurry is controlled to be 1/15-1/20;
(2) to the slurry was added dropwise saturated Ca (OH)2Adjusting the pH of the slurry to 8-9;
(3) adding the slurry into a high-pressure reaction kettle 520, closing the top cover of the high-pressure reaction kettle 520, then filling oxygen into the high-pressure reaction kettle 520, and stirring the slurry in the high-pressure reaction kettle 520, wherein the stirring strength is 400-600r/min, and the reaction time is 2-3 h, so that the calcium sulfate whisker is hydrothermally synthesized in the high-pressure reaction kettle 520; the high-pressure oxygen is an oxidant in an oxidation stage, the magnesium chloride is used as a habit modifier, and the three specific processes of crystallization protection are combined with a crystallization theory:
1) dissolution oxidation process
The fine granularity ensures that the desulfurized fly ash has larger specific surface area, and the hydrothermal system has higher temperature and pressure and can promote CaSO3·0.5H2And (4) dissolving O. SO produced after dissolution3 2-Is oxidized into SO rapidly4 2-The oxidation reaction is carried out uninterruptedly, and CaSO is contained in the desulfurized fly ash3·0.5H2The O is constantly dissolved.
2) Crystallization process
Ca in solution as the dissolution oxidation process continues2+、SO4 2-When the concentration of Ca in the solution is increased2 +、SO4 2-When the temperature reaches a supersaturated state, crystals are precipitated. Experiments show that the reaction conditions are different, and the corresponding reaction products are also different, and the specific reaction equation is as follows:
Ca2++SO4 2-= CaSO4(fibrous)
Ca2++SO4 2-+1/2H2O = CaSO4·1/2H2O (fibrous)
Ca2++SO4 2-+ 2H2O = CaSO4·2H2O (fibrous)
3) Whisker growth process
Ca in solution after crystal nucleation2+、SO4 2-Still in a supersaturated state and still continuously precipitate in the form of crystals. At 180 ℃ in CaSO4Solubility lower than CaSO4·0.5H2O and CaSO4·2H2O，CaSO4Will be rapidly condensed with the crystal nucleus as the center; meanwhile, according to the directional growth characteristic of the calcium sulfate whisker and under the action of a crystal habit modifier, the crystal can continuously grow, and finally the acicular calcium sulfate whisker is formed. SEM pictures of calcium sulfate whiskers prepared using this example are shown in fig. 2.
Comparative example 1
The basic contents of comparative example 1 are the same as example 4, except that: in the first step: in the pretreatment of the desulfurization ash, the iron powder in the desulfurization ash is not separated, but the whisker is prepared directly by the desulfurization ash with the iron powder. SEM pictures of calcium sulfate whiskers prepared using this comparative example are shown in fig. 3.
Comparing fig. 8 and 9, it is shown that the calcium sulfate whiskers produced using example 4 are relatively ordered and that the calcium sulfate whiskers are produced relatively quickly. The reasons for this may be: comparative example 1 inIn the process of preparing the calcium sulfate crystal whisker, the desulfurized ash contains a large amount of CaSO3In this embodiment, a physical impurity removal process is introduced, iron powder in desulfurized ash is removed by using an electromagnet, and if the desulfurized ash from which the iron powder is not separated is directly used for hydrothermal reaction to synthesize calcium sulfate whiskers, the iron powder and CaSO in a hydrothermal system can be mixed3The dissolved oxygen in the slurry is strived for, and meanwhile, the iron powder becomes the crystal attachment point of the new calcium sulfate, so that a large amount of calcium sulfate whiskers are nucleated, but the growth is slow, and the removal of the iron powder in the desulfurized fly ash is beneficial to the growth process of the calcium sulfate whiskers. In the process of preparing the calcium sulfate whisker in the embodiment 1, the iron powder in the desulfurized fly ash is physically removed, so that the iron powder in the desulfurized fly ash is effectively removed, and the preparation quality of the calcium sulfate whisker is improved.
It is worth noting that MgCl was formulated at a concentration of 2%2The solution acts as a habit modifier to MgCl2Adding the pretreated desulfurized ash into the solution, uniformly stirring to obtain slurry, controlling the solid-to-liquid ratio of the slurry to be 1/15-1/20, avoiding the desulfurized ash in the slurry from caking, and simultaneously enabling the desulfurized ash to have larger specific surface area due to the finer granularity; adding the slurry which is fully and uniformly stirred into the high-pressure reaction kettle 520, closing the top cover of the high-pressure reaction kettle 520, then filling oxygen into the high-pressure reaction kettle 520, controlling the stirring strength in the high-pressure reaction kettle 520 to be 400-600r/min, and controlling the reaction time to be 2-3 h, so that the hydrothermal system has higher temperature and pressure, and can promote CaSO in the desulfurized ash3·0.5H2Dissolving O, SO produced after dissolving3 2-Is oxidized into SO rapidly4 2-The oxidation reaction is carried out uninterruptedly, and CaSO is contained in the desulfurized fly ash3·0.5H2Continuously dissolving O and Ca in the solution2+、SO4 2-Is always in a supersaturated state, provides power for crystallization and growth of the calcium sulfate whisker, realizes the synergistic preparation of the calcium sulfate whisker by oxidizing the sintering flue gas desulfurization ash, and solves the problem of CaSO3The difficulty of difficult rapid oxidation and long process flow of the preparation of the calcium sulfate whisker, and provides theoretical basis for high value-added resource utilization of the sintering flue gas desulfurization ash.
The invention has been described in detail hereinabove with reference to specific exemplary embodiments thereof. It will, however, be understood that various modifications and changes may be made without departing from the scope of the invention as defined in the appended claims. The detailed description and drawings are to be regarded as illustrative rather than restrictive, and any such modifications and variations are intended to be included within the scope of the present invention as described herein. Furthermore, the background is intended to be illustrative of the state of the art as developed and the meaning of the present technology and is not intended to limit the scope of the invention or the application and field of application of the invention.
Claims (7)
1. A calcium sulfate whisker preparation system which is characterized in that: comprises that
The iron powder recovery device is used for separating iron powder in desulfurized ash and comprises an air inlet pipe (100), an iron powder recovery cavity (200), a top cover (310) and a back-blowing air tank (410), wherein an electromagnet and a cotton sleeve (203) are arranged in the iron powder recovery cavity (200), the cotton sleeve (203) is wrapped outside the electromagnet, the electromagnet comprises a lead (202) and an iron core (205), the lead (202) is wound outside the iron core (205), a vent hole (204) is formed in the surface of the iron core (205), the vent hole (204) is communicated with the barrel center of the iron core (205), the top cover (310) is arranged at the top of the iron powder recovery cavity (200), a filter layer (320) is arranged inside the top cover (310), the air inlet pipe (100) is arranged at the bottom of the iron powder recovery cavity (200), desulfurized ash enters the iron powder recovery cavity (200) through the air inlet pipe (100), the back-blowing air tank (410) is connected with the barrel center of the iron powder recovery cavity (205) through a gas pipeline, an air inlet pipe (100) is provided with the air inlet pipe (140), the air inlet pipe (100) and the back-blowing air tank (210), the back-blowing air tank (210) is arranged between the left electromagnet (120) and the right electromagnet (220), a second electromagnet, a third electromagnet (220) and a fourth electromagnet, the electromagnet (220) are arranged between the left electromagnet, the left electromagnet (231) and the right electromagnet, the left electromagnet (220) and the right electromagnet, the electromagnet (220), the electromagnet, the left electromagnet (220), the left electromagnet (210) and the right electromagnet (220), the left electromagnet (220), the right electromagnet (220) and the left electromagnet (220), the left electromagnet (210) and the right electromagnet (230) and the right electromagnet (220), the left electromagnet (220), the right electromagnet (120) are arranged between the left electromagnet (120) and the right electromagnet (220), the electromagnet (120) and;
the suction filtration device is used for removing large-particle insoluble substances in the desulfurized ash and comprises a filter, a circulating water vacuum pump (650) and a suction filtration unit, wherein the circulating water vacuum pump (650) is connected with a suction opening (620) of the suction filtration unit through a rubber hose (640);
the reaction device is used for preparing the calcium sulfate whiskers from the desulfurized ash after the iron powder is separated and comprises an oxygen cylinder (510) and a high-pressure reaction kettle (520), wherein the oxygen cylinder (510) is connected with an air inlet (523) at the top of the high-pressure reaction kettle (520) through a pipeline.
2. The calcium sulfate whisker preparation system of claim 1, wherein: an oxygen valve (528) is arranged on the air inlet (523) at the top of the high-pressure reaction kettle (520), a pressure release valve (521) is arranged on a pipeline between the air inlet (523) and the high-pressure reaction kettle (520), an air pressure gauge (522) is arranged on the high-pressure reaction kettle (520), and a stirring blade (525) is arranged in the high-pressure reaction kettle (520).
3. The calcium sulfate whisker preparation system of claim 1, wherein: the suction filtration unit comprises a Buchner funnel (610), an air suction port (620) and a vacuum pumping bottle (630), wherein the Buchner funnel (610) is arranged above the vacuum pumping bottle (630), the air suction port (620) is arranged on one side of the vacuum pumping bottle (630), the air suction port (620) is connected with a circulating water vacuum pump (650) through a rubber hose (640), and the filter is arranged above the Buchner funnel (610).
4. The calcium sulfate whisker preparation system of claim 1, wherein: an air flow main pipe (420) is connected to the back flushing air tank (410), a first air flow branch pipe (421) and a second air flow branch pipe (422) are connected to the air flow main pipe (420), and the first air flow branch pipe (421) is communicated with two ends of an iron core (205) of the third electromagnet (230); the second air flow branch pipe (422) is respectively communicated with the iron cores (205) of the first electromagnet (210) and the second electromagnet (220).
5. The calcium sulfate whisker preparation system of claim 1, wherein: the desulfurization ash is sprayed into the iron powder recovery cavity (200) by the blowing air flow of the air inlet pipe (100), the desulfurization ash is sprayed to the periphery of the electromagnet under the action of the blowing air flow, the iron powder in the desulfurization ash is adsorbed on the surface of the cotton sleeve (203) by the electromagnet, and meanwhile, the back blowing air flow overflows outwards through the vent holes (204) on the surface of the electromagnet iron core (205) to avoid the desulfurization ash from permeating into the cotton sleeve (203).
6. A calcium sulfate whisker preparation system according to claim 3, characterized in that: the middle part of the filter is provided with a filter screen (710), the filtering pore diameter of the filter screen (710) is smaller than the diameter of large-particle insoluble substances and is simultaneously larger than the diameter of the desulfurized fly ash, the bottom of the filter is provided with a filtering outlet (720), and the filtering outlet (720) is arranged on the upper part of the Buchner funnel (610).
7. A calcium sulfate whisker preparation system as set forth in any one of claims 1 to 6, wherein: an air flow main pipe (420) is connected to the back flushing air tank (410), a first air flow branch pipe (421) and a second air flow branch pipe (422) are connected to the air flow main pipe (420), and the first air flow branch pipe (421) is communicated with two ends of an iron core (205) of the third electromagnet (230); the second air flow branch pipe (422) is respectively communicated with the iron cores (205) of the first electromagnet (210) and the second electromagnet (220).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811008707.1A CN108998833B (en) | 2018-08-31 | 2018-08-31 | Calcium sulfate whisker preparation system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811008707.1A CN108998833B (en) | 2018-08-31 | 2018-08-31 | Calcium sulfate whisker preparation system |
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| CN108998833A CN108998833A (en) | 2018-12-14 |
| CN108998833B true CN108998833B (en) | 2020-07-03 |
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| CN111977678B (en) * | 2019-05-24 | 2022-11-25 | 新疆天富环保科技有限公司 | Slurry treatment system and method for wet desulphurization by using semidry desulphurization ash |
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| CN201791675U (en) * | 2010-09-21 | 2011-04-13 | 山东泓奥电力科技有限公司 | High-field intensity magnetic separation coal-desulfurization device |
| CN102912445A (en) * | 2012-10-22 | 2013-02-06 | 浙江天蓝环保技术股份有限公司 | Process and device for preparing gypsum whisker by semi-dry desulfurized fly ash and waste acid |
| CN106757363B (en) * | 2016-11-29 | 2019-05-07 | 安徽工业大学 | A method of calcium sulfate crystal whiskers are prepared using sintering flue gas desulfurization by-product |
| CN107400929B (en) * | 2017-03-03 | 2019-07-09 | 安徽工业大学 | A method of the sintering flue gas semi-dry desulphurization ash based on acid oxidation prepares calcium sulfate crystal whiskers |
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